Application of Zeolite Molecular Sieve for Insulating Glass

1. What is the special zeolite molecular sieve for hollow glass: Only those molecular sieves that meet all performance indexes of insulating glass and have no influence on their physical and chemical properties can qualify as special molecular sieves for hollow glass. Only 3A molecular sieves are required to meet this requirement.
2. Why only 3A zeolite molecular sieves are qualified for use in insulating glass:
(1) The 3A zeolite molecular sieve only adsorbs water and does not adsorb oxygen and nitrogen in the air.
(2) The 3A zeolite molecular sieve is weakly alkaline and has a pH of 10.5 and will not damage the aluminum strip in the hollow glass. (3) The 3A zeolite molecular sieve has a fast water absorption rate and a water absorption rate of 0.04 g/s.
(4) The 3A zeolite molecular sieve has a large amount of water absorption, and the water absorption amount is ≥ 20%.
(5) The 3A zeolite molecular sieve does not generate hydrolytic absorption at room temperature.
3. Why 4A Zeolite Molecular Sieves Cannot Be Used in Insulating Glass: In addition to adsorbing oxygen and nitrogen in the air, 4A zeolite molecular sieve will cause the hollow glass to change by external temperature and pressure, convex or concave (when the outside temperature rises. High, 4A zeolite molecular sieves will release the adsorbed nitrogen and oxygen and cause the internal pressure of the insulating glass to be stronger than the external pressure, and the hollow glass will be convex.When the ambient temperature decreases, the 4A zeolite molecular sieve will adsorb nitrogen and oxygen to make the external pressure stronger than the insulating glass. Internal pressure, hollow glass convexity disappears or concave). Such a convex-concave will have an impact on the sealing performance of the insulating glass, and more severely will cause the hollow glass to break.
4. Why the common desiccant (desiccant with attapulgite as raw material) cannot be used in insulating glass:
(1) The desiccant adsorbs oxygen, nitrogen, and carbon dioxide in addition to the moisture in the air. (When the outside temperature rises, the desiccant will release the adsorbed nitrogen and oxygen and cause the internal pressure of the insulating glass to be stronger than the external pressure. Convex. When the outside temperature decreases, the desiccant adsorbs nitrogen and oxygen to make the external pressure stronger than the internal pressure of the insulating glass, and the hollow glass convexity disappears or concaves) which will affect the life of the insulating glass.
(2) The desiccant has a low adsorption at a relatively low temperature or a high temperature and can affect the dew point of the insulating glass.
(3) The adsorption rate is slow, and the adsorption of water depends on affinity. Hydrolysis will occur at room temperature or at high temperatures (≥40°C), which will affect the transparency of the insulating glass.
5. Why does zeolite zeolite not produce hydrolyzed at room temperature?
The adsorption of water by zeolite molecular sieves is adsorbed by van der Waals forces. From the microscopic point of view, the interior of the molecular sieve pores reaches the electrostatic equilibrium. The water molecules are polar molecules and decompose into hydrogen ions and hydroxide ions. In the adsorption process of water, the molecular sieve reacts with the hydrogen ions and hydroxide ions after the decomposition of the water molecules to reach the electrostatic equilibrium again, breaking the oxygen and hydrogen bonds to release energy (temperature rise phenomenon). The whole process is a physical reaction. Therefore, the molecular sieve does not generate hydrolytic absorption at normal temperature.